I have been able to build other kernels, like when I enabled a high resolution console to fit my 1600x1200 monitor. This time, I wanted to enable the ULE scheduler. I also cut a lot of the unnecessary drivers out of my kernel. Now when building it, I get this error:

Same thing happened to me. I disabled 'wlan', but I forgot some USB wireless card, which obviously needed 'wlan'. It is silly to feel you wrong after an hour of kernel compilation... There should be a tool available for checking kernel configurations for that kind of mistakes.